Area2D -> CollisionObject2D -> InputEvent -> object count rises when moving the mouse С#

Help
, , ,
1

Godot Version

4.3.stable.mono

Question

I am writing a simple game in C# where you need to click on objects to change their state.
I connect the signal to Area2D:

InputEvent += OnInputEvent;

private void OnInputEvent(Node viewport, InputEvent @event, long shapeIdx)
{
    if (@event.IsActionPressed("UITouch"))
    {
        double objCount = Performance.GetMonitor(Performance.Monitor.ObjectCount);
        GD.Print(objCount);
    }
}

Everything compiles and works.
However, I noticed in the debugger that when moving the mouse over Area2D and clicking on it, objects started to appear:

ObjRises
ObjRises930×214 9.08 KB

After reading the internet, I added an explicit indication that the user input has been handled:

private void OnInputEvent(Node viewport, InputEvent @event, long shapeIdx)
{
    if (@event.IsActionPressed("UITouch"))
    {
        double objCount = Performance.GetMonitor(Performance.Monitor.ObjectCount);
        GD.Print(objCount);

        GetTree().GetRoot().SetInputAsHandled();
    }
    else
    {
        GetTree().GetRoot().SetInputAsHandled();
    }
}

But objects continue to be created when moving and clicking the mouse.

After that, I tried another option for explicitly indicating that the user input was handled.

private void OnInputEvent(Node viewport, InputEvent @event, long shapeIdx)
{
    if (@event.IsActionPressed("UITouch"))
    {
        double objCount = Performance.GetMonitor(Performance.Monitor.ObjectCount);
        GD.Print(objCount);

        GetViewport().SetInputAsHandled();
    }
    else
    {
        GetViewport().SetInputAsHandled();
    }
}

But objects continue to be created when moving and clicking the mouse.

I also tried writing it a bit differently:

private void OnInputEvent(Node viewport, InputEvent @event, long shapeIdx)
{
    if (@event is InputEventMouseButton)
    {
        double objCount = Performance.GetMonitor(Performance.Monitor.ObjectCount);
        GD.Print(objCount);

       // With different options for explicitly indicating that the user input was handled (GetViewport() //  GetTree().GetRoot()).
    }
    else
    {
        // With different options for explicitly indicating that the user input was handled (GetViewport() //  GetTree().GetRoot()).
    }
}

But objects continue to be created when moving and clicking the mouse.

As a result, I decided to try writing this code in GDScript:

extends Area2D

func _ready():
	connect("input_event", Callable(_on_input_event))

func _on_input_event(viewport, event, shape_idx):
	if event.is_action_pressed("UITouch"):
		var objCount = Performance.get_monitor(Performance.Monitor.OBJECT_COUNT)
		print(objCount)

Or

func _on_input_event(viewport, event, shape_idx):
	if event is InputEventMouseButton:
		var objCount = Performance.get_monitor(Performance.Monitor.OBJECT_COUNT)
		print(objCount)

And everything is fine! Objects are not created either when clicking or when moving the mouse if written in GDScript!

What am I doing wrong? How do I fix the problem in C#?